S3 Self-Support Stadium Seat: Extended Backrest for Ultimate Comfort For sports fans seeking maximum comfort, the S3 offers a taller backrest than the S2. With a sturdy internal frame, plush padding, and straightforward installation on bleachers, you can enjoy the entire event free from constant shifting or back pain. Enhanced Back Height: Supports lower back to shoulder blades. Foldable & Portable: Collapses for easy transport. 17? x 16? x 0.5? Thick Weight: 1.3 lbs.